I personally always have a tank of domestic hot water all day it ticks over all day from oil fired boiler. (1 in House) Cylinder is small but has fast recovery rate pre-lagged.
My mother heats bath water by immersion heater and kettle for washing up. Medium cylinder with Jacket. (1 in House)
My brother is on economy through night store and makes it last all day. (2 in house) purpose built economy cylinder. Wont use the boost unless absolute necessary.
I suppose its what suits us best.